JP5658191B2 - Underground pile cutting equipment - Google Patents

Description

  The present invention relates to a pile buried in the ground for construction of a building foundation or ground improvement (hereinafter referred to as an underground pile) for replacement of a building, new ground improvement, etc. It is related with the improvement of the underground pile cutting apparatus which cuts the outer peripheral surface of an underground pile circularly so that it may become the length dimension which is easy to remove the underground pile which the excavation was excavated when removing from underground .

  Conventionally, the underground pile cutting device includes a casing that is positioned around the excavated underground pile, a casing drive device that rotates or stops the casing, and an outer peripheral surface of the underground pile while revolving the outer periphery of the underground pile. There is a wire saw that annularly cuts the wire saw and a guide device that guides the wire saw from a standby state in which the wire saw is separated from the outer peripheral surface of the underground pile to a cutting state in which the wire saw is wound around the outer peripheral surface of the underground pile in a horizontal arc shape ( Patent Document 1).

Japanese Patent No. 4370585

  In the conventional underground pile cutting apparatus, the cutting speed of the wire saw when cutting the outer peripheral surface of the underground pile is uniquely determined by the speed at which the wire saw revolves around the outer periphery of the underground pile as the casing rotates. However, the underground pile cutting device has a problem that the cutting speed of the wire saw is limited from the limit of the speed of rotating the casing, and the working time for the pile cutting becomes long.

  In order to solve the above-described problems, an object of the present invention is to provide an underground pile cutting apparatus that can increase the cutting speed of a wire saw and reduce the working time for pile cutting.

Underground pile cutting apparatus according to the present invention includes a casing to be positioned around the outside of the excavated ground stakes, and the casing drive unit for rotating or stopping the casing,該地by traveling around the outside of the ground stakes a wire saw for cutting an outer peripheral surface of the middle pile annularly derived from a standby state leaving the wire saw from the outer peripheral surface of the ground pile up cutting state wound around the arcuate horizontal to the outer circumferential surface of the ground stakes induction in underground pile cutting apparatus provided with a device, wherein the wire saw is stretched in the running freely endless in pulleys are driven at a switching cutting speed increases devices, the cutting speed increased device of the ground stakes a sun means attached to a fixed member fixed by placing the head, is rotatably supported by the rotary member to revolve around the outside of the fixing member, and the solar unit and the transmission operably linked planetary means A drive pulley for driving the wire saw is transmission coupled to the planetary unit, the driving force of the casing drive unit is disposed between said rotary member and said casing to said rotary member through said casing have a rotational force transmission means for transmitting, the planetary unit is characterized that you have been configured so as to increase the cutting speed in comparison with when only revolve.

In order to further accelerating the cutting speed of the wire saw, characterized in that a speed increasing device between said drive pulley and said planetary means.

In order to switch smoothly wire saw cutting state and the standby state, the guide device is, with the rotary mounted has been one of the pile winding pulley members, is arranged between the rotary member and the stationary member wherein comprising a fixing member rotatably supported intermediate rotor mounted to the other of the pile winding pulley to the, an inductive switching means disposed between the intermediate rotating body and the rotating member Te, the by changing the positive and reverse rotational direction of the rotational force positional relationship between the intermediate rotating body is transmitted to by both pile winding pulley through the induction switching means of the rotating member with the driving of the casing drive unit , characterized in that to switch the wire saw cutting state and the standby state.

In order to switch smoothly wire saw cutting state and the standby state, the guide device is, the passage of the wire saw a through space of the ground stakes are rotatably supported inside the fixed member is formed includes a cylindrical stand-cutting switching unit digits set in the horizontal direction parts, an inductive switch means disposed between said rotary member and said standby-cutting switching unit, the rotation caused by the driving of the casing drive unit and the rotational force of the normal and reverse rotational direction of the member is transmitted via the inductive switching unit to the standby-cutting switching unit, the wire saw, a standby state is brought into contact with the outer peripheral surface of the standby-cutting switching unit , characterized in that to switch to the cutting state Ru only passes to the passage unit.

Underground pile cutting apparatus according to the present invention, since it is possible to increase speed in switching cutting speed increase device cutting speed of wire saw can be shortened as compared with working time for cutting the underground pile traditional Can do. Moreover, the underground pile cutting device according to the present invention does not require a separate drive source for the cutting speed increasing device other than the casing drive device, and the device structure can be simplified to the extent that no separate drive source is provided.

The underground pile cutting apparatus according to the present invention, by accelerating the cutting speed of the wire saw by the speed increasing system, it is possible to further reduce the working time for cutting the underground pile.

The underground pile cutting apparatus according to the present invention, by changing one of the positional relationship between the horizontal direction changing pulley and the other horizontal direction changing pulley by the forward-reverse rotation of the rotating member with the driving of the casing drive unit The wire saw can be smoothly switched between the standby state and the cutting state .

Further , the underground pile cutting device according to the present invention is configured to be in a standby state in which a wire saw is brought into contact with the outer peripheral surface of the standby / cutting switching unit by the normal / reverse rotation of the rotating member accompanying the driving of the casing driving device, and the standby / cutting switching. can be smoothly switched to a cutting state Ru passed through a wire saw to the passage of the parts.

1 shows a first embodiment of an underground pile cutting device according to the present invention (hereinafter referred to as “the present invention device”), and after excavating the outer circumference of the underground pile P, cutting to the underground pile P It is a front view which abbreviate | omits the intermediate | middle state and shows a partial cross section. In the same embodiment, the main part of the device of the present invention for performing the next cutting on the underground pile P whose upper part has been removed by cutting is enlarged, the casing 4 is sectioned and a part of the rotating member 7 is broken. It is the front view which abbreviate | omitted the intermediate | middle shown, Comprising: The guidance apparatus 11 is made into the cutting state K by the guidance switching means 31, and the state which made the wire saw 10 contact | abut to the outer peripheral surface of the underground pile P is shown. In the same embodiment, the main part of the device of the present invention for performing the next cutting on the underground pile P whose upper part has been removed by cutting is an enlarged rear view, and is a rear view in which the middle is omitted, the guidance switching means The state which made the induction | guidance apparatus 11 the cutting state K in 31 and made the wire saw 10 contact | abut to the outer peripheral surface of the underground pile P is shown. In the same embodiment, the main part of the device of the present invention that performs the next cutting on the underground pile P whose upper part has been removed by cutting is enlarged, the casing 4 is cut in cross section and the other part is broken. It is the perspective view seen from, Comprising: The guidance apparatus 11 is made into the cutting state K with the guidance switching means 31, and the state which made the wire saw 10 contact | abut to the outer peripheral surface of the underground pile P is shown. In the same embodiment, the main part of the device of the present invention is enlarged, the casing 4 is cross-sectioned and the other part is broken from above, and is a perspective view as seen from above. The state in which the wire saw 10 is separated from the underground pile P in the standby state J is shown. 2A is a plan view taken along line C6A-C6A in FIG. 2, FIG. 2B is a plan view taken along line C6B-C6B in FIG. 2, and FIG. 2C is a cross section taken along line C6C-C6C in FIG. FIG. It is the top view which carried out the cross section which shows the state in the middle of making it move to the standby state which leaves | separates the wire saw 10 which cut the outer peripheral surface of the underground pile P from the underground pile P, Comprising: (A) is the C6A-C6A line of FIG. FIG. 2B shows a cross section taken along the line C6B-C6B in FIG. 2, and FIG. 2C shows a cross section taken along the line C6C-C6C in FIG. It is the top view which showed the standby state J which separated the wire saw 10 which cut | disconnected the outer peripheral surface of the underground pile P from the underground pile P, Comprising: FIG. (A) is a cross section in the C6A-C6A line equivalent location of FIG. FIG. 2B is a cross-sectional view taken along the line C6B-C6B in FIG. 2, and FIG. 2C is a cross-sectional view taken along the line C6C-C6C in FIG. It is sectional drawing which shows the principal part of another aspect of the cutting speed increase apparatus 12 in 1st Embodiment. The 2nd Embodiment of this invention apparatus is shown, the principal part of this invention apparatus 41 which performs the next cutting with respect to the underground pile P from which the upper part was removed is expanded, and the casing 4 and the rotation member 7 are cross-sectioned. In addition, the intermediate member that is shown by breaking the fixing member 6 is omitted, and a state in which the guide device 51 is cut by the guidance switching means 61 and the wire saw 10 is brought into contact with the outer peripheral surface of the underground pile P is shown. Is. 10A is a plan view taken along line C11A-C11A in FIG. 10, FIG. 10B is a plan view taken along line C11B-C11B in FIG. 10, and FIG. 10C is a cross section taken along line C11C-C11C in FIG. FIG. It is the top view which carried out the cross section which shows the standby state J which left | separated the wire saw 10 in the same embodiment from the underground pile P, Comprising: FIG. (A) is a cross section in the C11A-C11A line equivalent location of FIG. B) shows a cross section taken along the line C11B-C11B in FIG.

(First embodiment)
The present invention apparatus 1 according to the first embodiment shown in FIGS. 1 to 9 includes an excavation apparatus 2 for excavating the outer periphery of the underground pile P to form an excavation space S, as shown in FIG. And a cutting device 3 for cutting the cut portion Pf on the outer peripheral surface of the underground pile P whose outer periphery is excavated into an annular shape.

  The excavation apparatus 2 includes a cylindrical casing 4 for forming an excavation space S around the underground pile P buried in the underground E, and a casing drive apparatus that repeats forward and reverse rotation driving and stopping of the casing 4. 5

  As shown in FIG. 1, the casing 4 of the excavator 2 includes a basic portion 4A and a tip portion 4B provided with a plurality of excavating blades 4d on the lower end side, and the basic portion 4A and the tip portion 4B are detachably connected. Then, the upper end of the basic portion 4A is driven by the casing drive device 5 to transmit the rotational driving force to the tip portion 4B. The casing 4 is provided with a mud discharge spiral blade 4c on the outer peripheral surface of each part 4A, 4B, and is configured so that mud or the like generated by excavation of the excavating blade 4d can be pushed up by the spiral blade 4c and discharged to the ground. As the excavation progresses, the basic portion 4B is extended by adding a certain length dimension one after another.

  The casing driving device 5 of the excavating device 2 includes a rotary pushing device (not shown) that can push downward while rotating a chuck device (not shown) that grips the outer peripheral surface of the basic portion 4A of the casing 4. (For example, the one described in Japanese Patent Application Laid-Open No. 2008-7946), the underground pile P can cope with a large diameter of 1 to 3 mail.

  As shown in FIG. 3, the cutting device 3 is placed on the head Pb of the underground pile P and fixed to be non-rotatable, and the fixing member 6 is rotatably supported by the fixing member 6. An outer rotating member 7 that rotates around the outer periphery of the motor 6, an intermediate intermediate rotating member 8 that is disposed between the fixing member 6 and the rotating member 7, is rotatably supported by the fixing member 6, and rotates around the outer periphery of the fixing member 6. A wire saw stretcher 9 provided across the rotary member 7 and the intermediate rotor 8, a wire saw 10 stretched in an endless manner that can be run on the wire saw stretcher 9, and a stretched state Cutting state K (FIG. 2 thru | or figure) which winds around the outer peripheral surface of underground pile P in the horizontal arc from standby state J (refer FIG.5 and FIG.8 (C)) which separates wire saw 10 from the outer peripheral surface of underground pile P 4 and FIG. 6 (C)), and the wire saw 10 is stretched. A cutting speed increasing device 12 that travels along the direction, and the wire saw 10 in the cutting state K revolves around the underground pile P together with the wire saw stretcher 9 (rotation in the direction of arrow G shown in FIG. 4). The cutting speed of the wire saw 10 is increased as compared with the case where only the revolution is performed by traveling in the stretching direction with the cutting speed increasing device 12.

  As shown in FIG. 3, the fixing member 6 inside the cutting device 3 has a cylindrical large-diameter portion 6 a in the lower half in which the underground pile P can be externally fitted, and a cylindrical shape in the upper half in a smaller diameter than the underground pile P. Small-diameter portion 6b, an annular step portion 6c formed at the boundary between the lower half and the upper half, and a rotational anti-slip portion 6d provided on the lower surface side of the step portion 6c. The fixing member 6 is lowered while being suspended by the wire W, and the lower half large-diameter portion 6a is externally fitted to the underground pile P, and the rotational anti-slip portion 6d is brought into contact with the head Pb of the underground pile P. Thus, it is placed on the underground pile P so as not to rotate.

  As shown in FIG. 3, the rotating member 7 outside the cutting device 3 is formed on a cylindrical portion 7 a that fits the fixing member 6, and a small-diameter portion 6 b that is formed on the upper portion of the cylindrical portion 7 a. A weight receiving roller 6f disposed on the small-diameter portion 6b of the fixing member 6 and composed of an inner bending flange portion 7b and a lateral vibration preventing roller 7c, 7c... Disposed inside the inner bending flange portion 7b. , 6f..., 6b... The rotating member 7 has a work opening (not shown) at an appropriate position for facilitating maintenance and inspection of the wire saw stretching device 9 and the cutting speed increasing device 12 and confirmation of the tension state of the wire saw 10. Sometimes open.

  As shown in FIG. 3, the intermediate rotating body 8 in the middle of the cutting device 3 includes a cylindrical portion 8a that externally fits the fixing member 6 across the large diameter portion 6a and the small diameter portion 6b, and an inner side of the cylindrical portion 8a. The weight receiving portion disposed on the step portion 6c of the fixing member 6 includes the formed inner bending flange portion 8b and the lateral vibration preventing rollers 8c, 8c... Disposed inside the inner bending flange portion 8b. The inner bending flange portion 8b is rotatably mounted on the rollers 6g, 6g. The intermediate rotator 8 may have a working opening (not shown) at an appropriate position for maintenance and inspection of the lateral shake prevention roller 8c and the weight receiving roller 6g.

  The endless wire saw 10 of the cutting device 3 is made by fixing diamond beads for cutting, which are tough blades, to a steel wire at regular intervals, and can be easily used when cutting a concrete structure or the like. Since it can be obtained and easily deformed due to its flexibility, it is separated from the standby state J (see FIG. 5 and FIG. 8 (C)) that is not wound around the underground pile P away from the outer peripheral surface of the underground pile P. It can be easily moved to the cutting state K (see FIGS. 2 to 4 and FIG. 6 (C)) that is brought into contact with the outer peripheral surface of the intermediate pile P and is easy to handle.

  As shown in FIGS. 4 to 6B, the wire saw stretching device 9 of the cutting device 3 includes a pulley provided on the outer rotating member 7 side and a pulley provided on the intermediate intermediate rotating body 8 side. It consists of a combination, and in order toward the traveling direction (arrow F) for cutting the wire saw 10, the rotary shaft provided on the rotating member 7 side and the rotating shaft provided on the rotating member 7 side is provided on the rotating member 7 side. Is one pile winding pulley 14 that is horizontal, and the other rotation shaft 15 is provided on the side of the intermediate rotary body 8, and the other pulley winding pulley 15 is provided on the side of the intermediate rotation body 8, and the guide pulley 16 that is provided on the intermediate rotary body 8 side and that is horizontal , A plurality of guide pulleys 17, 17... Provided on the intermediate rotating body 8 side and having a vertical rotation axis, a guide pulley 18 and 19 provided on the rotating member 7 side and having a horizontal rotating shaft, and freely movable up and down to the rotating member 7 side. A tension applying pulley 20 provided with a horizontal rotation axis; Provided fine rotation member 7 side rotation shaft is formed of a horizontal guide pulleys 21. One pile winding pulley 14 and the other pile winding pulley 15 convert the traveling direction of the wire saw 10 from a horizontal state wound around the outer periphery of the underground pile P to a rising state. One pile winding pulley 14, the other pile winding pulley 15 and the guide pulleys 16, 18 have vertical axes as the wire saw 10 changes its tension state between the standby state J and the cutting state K. The wire saw 10 is not swung from the pulleys 14 and 15 so that the wire saw 10 is automatically swung around the pulley 14 and 15.

  The tension applying pulley 20 is rotatably attached to the tip of an output shaft 22 a of a fluid cylinder (for example, hydraulic cylinder) 22, and adjusts the pressure of the fluid (for example, oil) supplied to the fluid cylinder 22. The tension of the wire saw 10 (force that presses the wire saw 10 against the outer peripheral surface of the underground pile P) can be changed. The tension applying pulley 20 moves up and down when the winding length of the underground pile P changes with the progress of cutting. In addition, although illustration was abbreviate | omitted as another aspect which provides tension | tensile_strength to the wire saw 10, the guide pulley 19 and / or 21 may be arrange | positioned so that raising / lowering is possible, and the weight for tension | tensile_strength provision may be suspended from a pulley. . The pulley 20 in this case is a simple guide pulley that is disposed at a predetermined position and does not move up and down.

  As shown in FIG. 4, the cutting speed increasing device 12 of the cutting device 3 is connected to the solar means 25 attached to the fixed member 6 and rotatably supported by the rotating member 7 and connected to the solar means 25 so as to be able to transmit. The planetary means 26, the drive pulley 13 that is connected to the planetary means 26 so as to be able to be transmitted and travels the wire saw 10, and is arranged between the casing 4 and the rotating member 7 of the excavating device 2 and driven by the casing driving device 5. Is transmitted to the rotating member 7 through the casing 4. The cutting speed increasing device 12 is provided with a speed increasing device 29 made of a gear box or the like between the planetary means 26 and the driving pulley 15 as necessary so that the driving pulley 15 is faster than the planetary means 26 with respect to the number of rotations. is there.

  When the solar means 25 and the planetary means 26 are formed by belt pulleys, the cutting speed increasing device 12 wraps a transmission winding member 27 made of a belt around the solar means 25 and the planetary means 26 to transmit both the 25 and 26. When the sun means 25 and the planetary means 26 are formed of a chain procket, the transmission means 27 can be wound around the sun means 25 and the planetary means 26 by winding a transmission winding member 27 made of a chain. Connect to. Furthermore, when the cutting speed increasing device 12 is formed of a chain 25a in which the outer periphery of the solar means 25 is wound and fixed in a circular shape as shown in FIG. When the chain 25a is engaged with the chain procket of the planetary means 26 so as to be capable of transmission, and when the sun means 25 and the planetary means 26 are formed by gears (not shown), the sun means 25 and the planetary means 26 are connected to each other. Engage and connect so that transmission is possible. In any case, when the planetary means 26 rotates and revolves integrally with the rotating member 7 that rotates, the cutting speed increasing device 12 has a cutting speed of the wire saw 10 due to the total rotation of the planetary means 26 and the revolution. The outer diameter dimensions of the solar means 25 and the planetary means 26 are determined so as to be faster than the cutting speed of the wire saw 10 by the conventional revolution alone. When the speed increasing device 29 is provided, the outer diameter dimensions of the solar means 25 and the planetary means 26 are determined in consideration of the speed increasing rate of the speed increasing device 29.

  As shown in FIGS. 4 and 5, the rotational force transmitting means 28 of the cutting speed increasing device 12 is a locking piece projecting vertically along the inner peripheral surface of the basic portion 4 </ b> A of the casing 4 of the excavating device 2. 28a and a locking piece 28b projecting along the vertical direction on the outer peripheral surface of the rotating member 7, and by engaging both the locking pieces 28a and 28b in the rotation direction as the casing 4 rotates. The driving force of the casing driving device 5 is transmitted to the rotating member 7 through the casing 4. The locking piece 28a of the casing 4 can be engaged with the locking piece 28b of the rotating member 7 when the rotating member 7 of the cutting device 3 is moved to each of a plurality of cutting height positions of the underground pile P. It protrudes vertically (see FIG. 1). As shown in FIGS. 4 and 6C, the rotational force transmitting means 28 is a rotating member when the casing 4 rotates in the cutting direction G (in this example, the clockwise direction in this example) by the driving force of the casing driving device 5. 7 is also rotated in the cutting direction G. On the contrary, as shown in FIGS. 5, 7C and 8C, the casing 4 is moved in the non-cutting direction H (in the reverse rotation direction) by the driving force of the casing driving device 5. In this example, when rotating in the counterclockwise direction), the rotating member 7 is also rotated in the non-cutting direction H.

  As shown in FIGS. 4 and 5, the guide device 11 of the cutting device 3 includes the one pile winding pulley 14 attached to the rotating member 7 and the other one attached to the intermediate rotating body 8. It consists of a pile winding pulley 15 and a guidance switching means 31 arranged between the rotating member 7 and the intermediate rotating body 8, and the forward / reverse rotation of the rotating member 7 as the casing drive device 5 (see FIG. 1) is driven. The wire saw 10 is cut in the cutting state K (FIG. 4) by transmitting the rotational force in the rotational direction to the intermediate rotating body 8 via the guidance switching means 31 and changing the positional relationship between the two pile winding pulleys 14 and 15. And FIG. 6C) and a standby state J (see FIGS. 5 and 8C).

  As shown in FIGS. 4 to 8, the guidance switching means 31 of the guidance device 11 includes a locking piece 31 a projecting from the inner circumferential surface of the rotating member 7 along the vertical direction, and the outer circumferential surface of the intermediate rotating body 8. By engaging the locking pieces 31a and 31b in the cutting direction G, which is the forward rotation direction, as shown in FIG. The positional relationship between the one and the other pile winding pulleys 14 and 15 can be set to a cutting state K in which the wire saw 10 is wound around the outer periphery of the underground pile P, and as shown in FIG. By engaging 31c in the non-cutting direction H, which is the reverse rotation direction, the standby state J in which the wire saw 10 is separated from the outer peripheral surface of the underground pile P with respect to the positional relationship between the one and the other pile winding pulleys 14 and 15 (See FIG. 8C).

  When the endless wire saw 10 stretched by the wire saw stretching device 9 is in the cutting state K by the switching operation of the guidance switching means 31 as shown in FIG. 4, one and the other pile winding pulleys The extension dimension between 14 and 15 becomes so long that the underground pile P can be wound, and the extension dimension between the guide pulleys 16 and 18 becomes short, and the switching operation of the guidance switching means 31 as shown in FIG. In the non-cutting state K, as compared with the cutting state K, the tension dimension between the one and the other pile winding pulleys 14 and 15 is shorter and the tension dimension between the guide pulleys 16 and 18 is smaller. The length is increased so that the increase / decrease in the tension between the one and the other pile winding pulleys 14 and 15 and the increase / decrease in the tension between the guide pulleys 16 and 18 are canceled as much as possible. In addition, about the dimension which cannot cancel each other, the pulley 20 for tension | tensile_strength will be dealt with by raising / lowering. The wire saw 10 is guided by the guide pulleys 17, 17... As the stretched dimension between the guide pulleys 16, 18 becomes longer, and the winding area around the outer periphery of the intermediate rotating member 8 is increased.

  The cutting device 3 is assembled by temporarily placing the fixing member 6 on a temporary table (not shown), and then externally fitting the intermediate rotating member 8 to the fixing member 6 and rotatably supporting it. The outer rotary member 7 is fitted on the fixed member 6 and the intermediate rotary member 8 and the intermediate rotary member 7 is rotatably supported by the fixed member 6. Finally, the wire saw 10 is stretched and the cutting speed increasing device is stretched. 12 is assembled. Each member of the wire saw stretching device 9 and the cutting speed increasing device 12 is attached in advance to the intermediate rotating member 8 and the rotating member 7 before being fitted over. The assembled cutting device 3 is moved by lifting the upper end of the fixing member 6 with the wire W.

Next, each process of the method (pile extraction method) which cuts and removes the underground pile P using this invention apparatus 1 is demonstrated.
(1) 1st process (preparation process): As shown in FIG. 1, the earth and sand around the head of the underground pile P are removed, and the pile protrusion part Pa is formed. Next, the casing drive device 5 is installed on the ground surface. Subsequently, the casing 4 in which the basic portion 4A is connected to the tip portion 4B is suspended, and the pile protruding portion Pa is externally fitted at the tip portion 4B, and the basic portion 4A is connected to the casing driving device 5 and prepared.

(2) Second step (excavation step): The basic portion 4A of the casing 4 is pushed into the ground while being rotated by the activated casing driving device 5, and the outer periphery of the underground pile P is moved by the excavation blade 4d of the tip portion 4B. Is excavated to form an excavation space S around the underground pile P. The earth and sand generated by excavation is pushed up by the spiral blade 4c of the casing 4 and discharged to the ground. The excavation is performed up to the depth at which the underground pile P is cut and removed (generally, the depth to the tip of the underground pile P).

(3) Third step (cutting step): As shown in FIG. 1, the cutting device 3 is suspended so that the wire saw 10 of the assembled cutting device 3 is in a standby state (see FIG. 5), and the rotation is stopped. The cutting device 3 is lowered toward the excavation space S inside the caning 4, and the rotational anti-slip portion 6 d provided on the step portion 6 c of the fixing member 6 of the cutting device 3 is placed on the pile head Pb to fix the fixing member 6. Is fixed to be non-rotatable. When the fluid cylinder 22 of the wire saw stretcher 9 of the cutting device 3 is a hydraulic cylinder, hydraulic pressure is appropriately supplied to the fluid cylinder 22 via a hydraulic pipe (not shown), and the wire saw 10 is optimal for excavation. Keep it at a predetermined tension. Next, the casing drive device 5 is activated to rotate the basic portion 4A of the cane 4 in the cutting direction G (see FIG. 4) (in the normal rotation direction, in this example, the clockwise rotation direction), as shown in FIG. 6 (C). By engaging the locking pieces 28a and 28b of the rotation transmitting means 28 and the locking pieces 31a and 31b of the guidance switching means 31 in the cutting direction as described above, the wire saw 10 is shown in FIGS. The cutting state K shown in FIG. 3, FIG. 4 and FIG. In this cutting state K, the casing drive device 5 continues to rotate the casing 4 in the cutting direction, and the outer periphery of the underground pile P is continuously cut by the wire saw 10 of the cutting device 3 that rotates together with the casing 4. An annular concave groove Pe (see FIG. 7C) that opens laterally over the entire periphery of the outer peripheral surface of the intermediate pile P is formed. The cutting speed increasing device 12 also rotates by a transmission connection with the solar device 14 when the planetary means 26 attached to the rotating rotating member 7 revolves around the fixed annular solar means 25. In other words, the endless wire saw 10 can be driven by the drive pulley 13 that is connected to and rotated by the planetary means 26 that rotates at the total rotational speed of revolution and rotation via the speed increasing device 29 or not. The cutting speed of the wire saw 10 can be increased by rotating the planetary means 26 as compared with the case where the wire saw 10 is moved only by revolution. This cutting is a depth for cutting the vertical reinforcing bars Pd, Pd... Arranged near the outer periphery of the underground pile P, and the inner non-cutting portion Pc that can be cut and separated without the vertical reinforcing bars Pd. Continue until it is left.

(4) Fourth step (cutting and separating step): When the cutting is finished, the casing drive device 5 is stopped to stop the casing 4 and then the casing drive device 5 is started in the reverse rotation direction. Then, the cage 4 is rotated in the standby direction H (see FIG. 7C) (in the reverse rotation direction, in this example, the counterclockwise rotation direction), and as shown in FIG. 28a and 28b and the locking pieces 31a and 31c of the guidance switching means 31 are engaged with each other in the standby direction, whereby the wire saw 10 is cut from the cutting state K shown in FIG. 4 and FIG. 5 and FIG. 8C, the endless wire saw 10 is brought into a state in which it does not interfere with the underground pile P in the standby state J separated from the outer peripheral surface of the underground pile P. When the wire saw 10 enters the standby state J, the driving of the casing driving device 5 is stopped, and the cutting device 3 is lifted and removed from the excavation space S inside the caning 4. Next, an interval widening device (not shown) made of a hydraulic cylinder or the like is inserted between the vicinity of the pile head Pb of the underground pile P and the casing 4, and the vicinity of the ground head Pb is pressed to one side, A large bending moment is generated in the inner non-cutting portion Pc where the vertical reinforcing bar Pd does not exist, and the non-cutting portion Pc is cut. Finally, the ground surface side portion from which the underground pile P is cut and separated is pulled out by using a crane, a pile pulling-up device described in JP-A-2006-37657, or the like and removed from the ground to the ground.

(5) Fifth step (repeated excavation step-pile cutting and separation step): The third step (cutting step) in the case of cutting and separating the underground pile P located at a deeper position than the portion separated by cutting and separating. ) And the fourth step (cutting and separating step) are repeated as appropriate in this order, and the entire underground pile P is removed to the ground.

(6) Sixth step (post-cleaning step): If all of the underground piles P are removed to the ground, the cutting device 3 is removed from the inside of the casing 4, and the casing 4 is pulled out from the ground, if necessary. Then, fill the hole after removing the underground pile and complete the work.

  The cutting device 3 determines the height dimension from the rotation slip preventing part 6d of the fixing member 6 shown in FIG. 3 to the pile winding pulleys 14 and 15 according to the outer diameter dimension of the underground pile P, The weight from the head Pb of the pile P to the cutting / cutting position is set to a weight that can be pulled out in the fourth step (cutting separation step).

  Since this invention apparatus 1 can increase the cutting speed of the wire saw 10 with the cutting speed increase apparatus 12 compared with the conventional case which moves the wire saw 10 only by revolution, for cutting of the underground pile P The working time can be shortened compared to the conventional method. Further, the device 1 of the present invention does not require a separate drive source for the cutting speed increasing device 12 other than the casing drive device 5, and can simplify the structure of the device by the amount that the drive source is not separately provided.

  The device 1 of the present invention tries to leave pebbles or the like as cutting waste in the groove of the annular groove Pe formed by cutting on the outer peripheral surface of the underground pile P as the cutting with the wire saw 10 proceeds. Since 10 extrudes pebbles and the like from the inside of the groove with the revolution of the arrow G direction, the traveling wire saw 10 can smoothly enter the annular concave groove Pe without meshing with the pebbles and the like. The situation of cutting can be avoided.

(Second Embodiment)
The present invention device 41 according to the second embodiment shown in FIGS. 10 to 12 is greatly different from the present invention device 1 according to the first embodiment (see FIGS. 1 to 9). The intermediate rotating body 8 of the device 1 is omitted, and the standby / cutting switching unit 52 of the guidance device 51 is rotatably supported at the lower end of the fixing member 6. From this difference, the structures of the wire saw stretching device 59 and the guidance switching means 61 are different from those of the inventive device 1 according to the first embodiment. 10 to 12, the same reference numerals as those in FIGS. 1 to 9 showing the first embodiment denote the corresponding parts.

  The device 41 of the present invention includes the excavator 2 and the cutting device 43. The excavation device 2 includes a casing 4 and a casing drive device 5 (see FIG. 1), and is substantially the same as that in the first embodiment.

  As shown in FIG. 10, the cutting device 43 is placed on the head Pb of the underground pile P and fixed to be non-rotatable, and the fixing member 6 is rotatably supported by the fixing member 6. 6, an outer rotating member 7 that goes around the outer periphery of the wire 6, a wire saw stretching device 59 provided on the rotating member 7, an endless wire saw 10 that can be run on the wire saw stretching device 59, Cutting state K (FIG. 11 (B) in which the wire saw 10 in the suspended state is wound in a horizontal arc around the outer peripheral surface of the underground pile P from the standby state J (see FIG. 12 (B)) in which the wire saw 10 is separated from the outer peripheral surface of the underground pile P. ) See)) and a cutting speed increasing device 12 for causing the wire saw 10 to travel along the stretching direction. The wire saw 10 in the cutting state K is wound around the underground pile P by wire saw tension. Cutting speed while revolving with the frame 59 By traveling in the stretching direction with the increase device 12 (see FIG. 11B), the cutting speed of the wire saw 10 is increased as compared with the case of only revolving (rotating around the underground pile P). It is. The fixing member 6, the rotating member 7, the wire saw 10 and the cutting speed increasing device 12 constituting the cutting device 43 are substantially the same as those in the first embodiment.

  The rotating member 7 is provided with a plurality of guide rollers 62, 62... As necessary below the cylindrical portion 7 a, and the guide rollers 62 are not brought into contact with the outer peripheral surface of the large-diameter portion 6 a of the fixing member 6. Measures are taken to prevent touching.

  All of the pulleys constituting the wire saw tensioning device 59 are provided on the rotating member 7 side, and the rotation axis is horizontal in order toward the traveling direction (arrow F) for cutting the wire saw 10. Drive pulley 13, one pile winding pulley 14 whose rotation axis is horizontal, the other pile winding pulley 15 whose rotation axis is horizontal, a guide pulley 16 whose rotation axis is horizontal, a plurality of vertical rotation axes Guide pulleys 17, 17..., Guide pulleys 18 and 19 having a horizontal rotation axis, tension applying pulleys 20 provided so as to be movable up and down, and a guide pulley 21 having a horizontal rotation axis. One pile winding pulley 14 and the other pile winding pulley 15 convert the traveling direction of the wire saw 10 from a horizontal state wound around the outer periphery of the underground pile P to a rising state. As the tension state changes between the standby state J and the cutting state 10 and the winding state of the wire saw 10 with respect to the underground pile P changes during the cutting, the rocker 10 automatically swings around the vertical axis. The wire saw 10 is not removed from the pulleys 14 and 15 by being moved.

  As shown in FIG. 10, the guide device 51 is rotatably supported by the fixing member 6 so as not to drop off, and an underground passage penetrating space M is formed on the inner side, and an open passage 52b through which the wire saw P passes. Is provided with a cylindrical standby / cutting switching unit 52 provided in the horizontal direction, and a guidance switching unit 61 disposed between the rotating member 7 and the standby / cutting switching unit 52. A standby state in which the rotational force in the forward / reverse rotation direction of the member 7 is transmitted to the standby / cutting switching unit 52 via the guidance switching unit 61 and the wire saw 10 is brought into contact with the outer peripheral surface 52a of the standby / cutting switching unit 52. J (the state in which the wire saw 10 is separated from the outer peripheral surface of the underground pile P as shown in FIG. 12B) and the wire saw 10 are passed through the passage portion 52b of the standby / cutting switching portion 52 and the cutting state K ( Shown in Figure 11 (B) Are to switch the wire saw 10 to the state) cuttable to wound subjecting the outer circumferential surface of the ground pile P to.

  As shown in FIG. 10, the guidance switching means 61 of the guidance device 51 is provided on the outer circumferential surface of the locking piece 61 a that protrudes in the vertical direction on the inner circumferential surface of the rotating member 7 and the standby / cutting switching portion 52. It is made up of locking pieces 61b and 61c projecting along the vertical direction. As shown in FIG. 11 (B), the locking pieces 61a and 61b are engaged in the cutting direction G which is the normal rotation direction, thereby waiting. The cutting / switching unit 52 can be set to the cutting state K, and as shown in FIG. 12 (B), the locking pieces 61a and 61c are engaged in the non-cutting direction H which is the reverse rotation direction, thereby waiting / cutting switching unit 52. Can be set to the standby state J.

Next, each process of the method (pile extraction method) of cutting and removing the underground pile P using this invention apparatus 41 is demonstrated.
(1) First step (preparation step): substantially the same as that of the first embodiment.
(2) Second step (excavation step): substantially the same as the first embodiment.

(3) Third step (cutting step): As shown in FIG. 10, the cutting device 43 is suspended by the wire W and rotated so that the wire saw 10 of the assembled cutting device 43 is in a standby state (see FIG. 12). The cutting device 43 is lowered toward the excavation space S inside the stopped caning 4, and the rotational anti-slip portion 6 d provided on the step portion 6 c of the fixing member 6 of the cutting device 43 is placed on the pile head Pb. The fixing member 6 is fixed so as not to rotate. The wire saw 10 is kept in a predetermined tension optimum for excavation by the wire saw stretcher 59 of the cutting device 43. Next, the casing drive device 5 (see FIG. 1) is activated to rotate the basic portion 4A of the cane 4 in the cutting direction G (see FIG. 11) (in the forward rotation direction, in the clockwise direction in this example) to transmit the rotation. By engaging the locking pieces 28a, 28b of the means 28 and the locking pieces 61a, 61b of the guidance switching means 61 with each other in the cutting direction, the wire saw 10 can be seen from the standby state J shown in FIG. The cutting state K shown in FIG. In this cutting state K, the casing drive device 5 continues to rotate the casing 4 in the cutting direction, and the outer periphery of the underground pile P is continuously cut with the wire saw 10 of the cutting device 43 that rotates together with the casing 4. An annular concave groove Pe (see FIGS. 7C and 8C) that opens laterally over the entire circumference of the outer peripheral surface of the intermediate pile P is formed. The cutting speed increasing device 12 also rotates by a transmission connection with the solar device 14 when the planetary means 26 attached to the rotating rotating member 7 revolves around the fixed annular solar means 25. In other words, the endless wire saw 10 can be driven by the drive pulley 13 that is connected to and rotated by the planetary means 26 that rotates at the total rotational speed of revolution and rotation via the speed increasing device 29 or not. The cutting speed of the wire saw 10 can be increased by rotating the planetary means 26 as compared with the case where the wire saw 10 is moved only by revolution. This cutting is a depth for cutting the longitudinal reinforcing bars Pd, Pd... Arranged near the outer periphery of the underground pile P, and is an inner non-cutting portion Pc (that can be cut and separated without the longitudinal reinforcing bars Pd). The process is continued until the state shown in FIG.

(4) Fourth step (cutting and separating step): When the cutting is finished, the casing drive device 5 (see FIG. 1) is stopped to temporarily stop the casing 4, and then the casing drive device 5 is reversed. The locking member 28a, 38b of the rotation transmitting means 28 is rotated by starting in the rotation direction and rotating the cane 4 in the standby direction H (see FIG. 12B) (in the reverse rotation direction, counterclockwise rotation direction in this example). And by engaging each of the locking pieces 61a, 61c of the guidance switching means 61 in the standby direction, the wire saw 10 is grounded from the cutting state K shown in FIG. 11 (B) to the ground as shown in FIG. 12 (B). The standby state J separated from the outer peripheral surface of the intermediate pile P is set to a state in which the endless wire saw 10 does not interfere with the underground pile P. When the wire saw 10 enters the standby state J, the driving of the casing driving device 5 is stopped, and the cutting device 43 is lifted and removed from the excavation space S inside the caning 4. Next, the non-cutting portion Pc is cut in the same manner as in the first embodiment, and the ground surface side portion of the underground pile P that has been cut and separated is pulled out and removed from the ground to the ground.

(5) Fifth step (repeated excavation step-pile cutting and separation step): The third step (cutting step) in the case of cutting and separating the underground pile P located at a deeper position than the portion separated by cutting and separating. ) And the fourth step (cutting and separating step) are repeated appropriately in this order, and the entire underground pile P is removed to the ground.
(6) Sixth step (post-cleaning step): Substantially the same as in the first embodiment.

  The device 41 according to the present invention includes a standby state J in which the wire saw 10 is brought into contact with the outer peripheral surface 52a of the standby / cutting switching unit 52 and standby / cutting switching by forward / reverse rotation of the rotating member 7 accompanying the driving of the casing driving device 5. It is possible to smoothly switch to the cutting state K by passing the wire saw 10 through the passage part 52b of the part 52. Further, the device 43 of the present invention does not require a separate drive source for rotating the rotating member 7 forward / reversely other than the casing drive device 5, and can simplify the structure of the device by not providing a separate drive source. .

DESCRIPTION OF SYMBOLS 1 (43) ... this invention apparatus, 2 ... excavation apparatus, 3 ... cutting apparatus, 4 ... casing, 4A ... basic part, 4B ... tip part, 4c ... mud discharge spiral blade, 4d ... excavation blade, 5 ... casing drive Device 6 ... Fixing member 6a ... large diameter part 6b ... small diameter part 6c ... step part 6d ... rotating anti-slip part 6f ... weight receiving roller 6g ... weight receiving roller 7 ... Rotating member, 7a ... cylindrical portion, 7b ... inner bending flange portion, 7c ... lateral runout prevention roller, 8 ... intermediate rotation member, 8a ... cylindrical portion, 8b ... inner bending flange portion, 8c ... lateral deflection preventing roller, DESCRIPTION OF SYMBOLS 9 ... Wire saw tension device, 10 ... Wire saw, 11 ... Guidance device, 12 ... Cutting speed increase device, 13 ... Drive pulley, 14 ... One pile winding pulley, 15 ... Other pile winding pulley, 16 ... Guide pulley, 17 ... Guide pulley, 18 ... Guide pulley, 19 ... Guide pulley, 20 ... Pulling force, 21 ... guide pulley, 22 ... fluid cylinder, 22a ... output shaft, 25 ... sun means, 25a ... chain, 26 ... planet means, 27 ... winding member for transmission, 28 ... rotational force transmitting means, 28a ... locking piece, 28b ... locking piece, 29 ... speed increasing device, 31 ... induction switching means, 31a ... locking piece, 31b ... locking piece, 31c ... locking piece, 43 ... cutting device, 51 ... guiding device 52 ... Standby / cutting switching unit, 52a ... Outer peripheral surface, 52b ... Passing part, 59 ... Wire saw stretcher, 61 ... Induction switching means, 61a ... Locking piece, 61b ... Locking piece, 61c ... Locking piece 62 ... guide roller, E ... underground, F ... arrow (traveling direction for cutting), G ... cutting direction, H ... non-cutting direction, J ... standby state, K ... cutting state, M ... underground pile Penetration space, P ... underground pile, Pa ... projecting part, Pb ... pile head, Pc ... non-cutting part, d ... vertical reinforcing bars, Pe ... annular groove, Pf ... cutting portion, S ... drilling space, W ... wire

Claims (4)

A casing to be positioned around the outside of the excavated ground stakes, wires and casing drive unit for rotating or stopping the casing, the outer peripheral surface of the ground piles by traveling around the outside of the underground pile cutting annularly saw and, in underground pile cutting apparatus having a guide device for guiding the standby state leaving the wire saw from the outer peripheral surface of the ground pile up cutting state wound around the arcuate horizontal to the outer circumferential surface of the ground stakes,
The wire saw is stretched in the running freely endless in pulleys are driven at a switching cutting speed increased device,
Said cutting speed increased device rotatably supported and the sun means attached to a fixed member fixed by placing the head of the ground piles, the rotary member to revolve around the outside of the fixing member, and a planetary unit which is a transmission coupled to the sun means, a drive pulley for driving the wire saw is transmission coupled to the planetary unit, the casing drive unit is disposed between said rotary member and said casing have a rotational force transmitting means for the driving force transmitted to the rotary member through said casing, said planetary means is configured so as to increase the cutting speed in comparison with when only revolves and wherein Rukoto Underground pile cutting equipment. The underground pile cutting apparatus according to claim 1 , wherein a speed increasing device is provided between the planetary means and the drive pulley. The guidance device includes:
One pile winding pulley attached to the rotating member;
Other and pile winding pulley that is attached to the intermediate rotating body rotatably supported on said fixed member is disposed between said rotary member and said stationary member,
And a induction switch means disposed between the intermediate rotating body and the rotating member,
Altering the positional relationship of said rotary positive and reverse rotational force of the rotation direction through the inductive switching unit is transmitted to the intermediate rotating body both pile winding pulley member with the driving of the casing drive unit The underground pile cutting apparatus according to claim 1 or 2 , wherein the wire saw is switched between a standby state and a cutting state. The guidance device includes:
And the wire tubular stand-cutting switching section passing section digits set in the horizontal direction of the saw with the through space of the underground pile inside is formed is rotatably supported by the fixing member,
And a induction switch means disposed between said rotary member and said standby-cutting switching unit,
Said rotation force in the forward and backward rotation direction of the rotary member caused by the driving of the casing drive unit is transmitted via the inductive switching unit to the standby-cutting switching unit, the wire saw, the standby-cutting switching unit underground pile cutting apparatus according to claim 1 or 2 and a standby state to abut on the outer peripheral surface, and is switched to a cutting state Ru only passes to the passage of the.

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